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A method of preparing high-rate polymer foam using PMMA/PVDF blends under low pressure conditions

A technology of blends and polymers, applied in the field of polymer material processing, can solve the problems of high cost, large pollution, complicated process, etc., and achieve the effects of low cost, guaranteed safety and simple process

Active Publication Date: 2020-05-19
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods are often complicated in process, high in cost and heavy in pollution, and all require high temperature and high pressure process conditions, which put forward high requirements on the pressure and high temperature resistance of the equipment, and at the same time bring certain risks to safe production

Method used

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  • A method of preparing high-rate polymer foam using PMMA/PVDF blends under low pressure conditions
  • A method of preparing high-rate polymer foam using PMMA/PVDF blends under low pressure conditions
  • A method of preparing high-rate polymer foam using PMMA/PVDF blends under low pressure conditions

Examples

Experimental program
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Effect test

Embodiment 1

[0070] Example 1: When the saturation pressure is 1.72MPa, a PVDF / PMMA blend (the composite weight ratio of PVDF is 40%) is foamed with supercritical carbon dioxide to prepare a large-scale polymer foam

[0071] The PVDF and PMMA particles were dried in a vacuum drying oven, the temperature of the vacuum drying was set at 90° C., and the drying time was 5 hours. The vacuum-dried granules were melt-blended in a twin-screw extruder at a weight ratio of 40 / 60. The blending temperature used was 200° C., the blending time was 15 minutes, and the screw speed was 60 r / min. After the blending was completed, the above-mentioned blend was extruded into cylindrical specimens with a diameter of 3 mm and cooled in air. The above-mentioned splines were cut into cylinders of about 1 cm, and placed in a closed kettle purged with carbon dioxide. Introduce carbon dioxide with a pressure of 1.72MPa into the kettle, keep the temperature of the kettle at 25°C, and keep it at constant temperature ...

Embodiment 2

[0072] Example 2: When the saturation pressure is 3.45MPa, PVDF+PMMA (the composite weight ratio of PVDF is 40%) blend supercritical carbon dioxide foaming to prepare large-scale polymer foam

[0073] The PVDF and PMMA particles were dried in a vacuum drying oven, the temperature of the vacuum drying was set at 90° C., and the drying time was 5 hours. The vacuum-dried PVDF and PMMA particles were melt-blended in a twin-screw extruder at a weight ratio of 30 / 70. The blending temperature used was 200°C, the blending time was 15 minutes, and the screw speed was 60r / min. . After the blending was completed, the above-mentioned blend was extruded into cylindrical specimens with a diameter of 3 mm and cooled in air. The above-mentioned splines were cut into cylinders of about 1 cm, and placed in a closed kettle purged with carbon dioxide. Introduce carbon dioxide with a pressure of 3.45 MPa into the kettle, keep the temperature of the kettle at 25° C., and maintain constant tempera...

Embodiment 3

[0074] Example 3: When the saturation pressure is 3.45MPa, a PVDF+PMMA blend (the compounding weight ratio of PVDF is 20%) is foamed with supercritical carbon dioxide to prepare a large-scale polymer foam

[0075] The PVDF and PMMA particles were dried in a vacuum drying oven, the temperature of the vacuum drying was set at 90° C., and the drying time was 5 hours. The vacuum-dried PVDF and PMMA particles were melt-blended in a twin-screw extruder at a weight ratio of 20 / 80. The blending temperature used was 200°C, the blending time was 15 minutes, and the screw speed was 60r / min. . After the blending was completed, the above-mentioned blend was extruded into cylindrical specimens with a diameter of 3 mm and cooled in air. The above-mentioned splines were cut into cylinders of about 1 cm, and placed in a closed kettle purged with carbon dioxide. Introduce carbon dioxide with a pressure of 3.45 MPa into the kettle, keep the temperature of the kettle at 25° C., and maintain con...

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Abstract

The invention provides a method for preparing high-foaming-ratio polymer foam by utilizing a polymethyl methacrylate / polyvinylidene fluoride (PMMA / PVDF) blend under a low-pressure condition, and belongs to the field of high polymer material processing. The method comprises the following steps: 1) carrying out melt blending on PVDF and PMMA to prepare an amorphous or low-crystallization blend blank; 2) subjecting the blend blank to swelling adsorption at a saturation temperature and under a fluid (foaming agent) pressure until the blend blank is adsorbed to be saturated, so as to form a blend / fluid homogeneous system; and 3) quickly releasing the pressure of the homogeneous system, placing the homogeneous system in a high-temperature medium for carrying out rapid heating, and carrying out high-temperature foaming to obtain the high-foaming-ratio polymer foam. According to the invention, the high-foaming-ratio polymer foam can be efficiently prepared under a low-pressure condition, and the foam-pore structure of the polymer foam can be effectively regulated and controlled by adjusting the proportion of the blending components and process parameters. Moreover, the technology is simple, the process is green and safe, and the cost is low.

Description

technical field [0001] The invention belongs to the field of polymer material processing, and in particular relates to a method for preparing high-magnification polymer foams by using PMMA / PVDF blends under low-pressure conditions. Background technique [0002] There are a large number of tiny cells inside the polymer foam, which has excellent properties such as high specific strength, heat insulation, shock absorption and sound absorption, so it is widely used in many fields such as building insulation, aerospace, transportation, packaging and home appliances. Among the many methods for preparing polymer foam, the supercritical carbon dioxide foaming method is widely used due to its obvious advantages such as simple process, high efficiency and controllability, environmental protection and pollution-free. However, the supercritical carbon dioxide foaming method often requires high temperature and high pressure process conditions, which puts forward high requirements on the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J9/12C08L33/12C08L27/16
CPCC08J9/0061C08J9/122C08J2203/06C08J2327/16C08J2333/12
Inventor 王桂龙史展林赵国群柴佳龙董桂伟
Owner SHANDONG UNIV